Garage Conversions: Mililani Mauka vs Urban Honolulu
How do garage conversions rules compare between Mililani Mauka, HI and Urban Honolulu, HI?
Urban Honolulu has fewer restrictions than Mililani Mauka.
Mililani Mauka, HI
Honolulu County
Garage conversions in Mililani Mauka follow ADU rules under ROH Sec. 21-5.720 and permit rules under Sec. 18-3.2, plus separate Mililani Mauka Community Association design approval.
View full Mililani Mauka rules →Urban Honolulu, HI
Honolulu County
Urban Honolulu garage conversions must meet ADU rules in ROH Sec. 21-5.720 plus building-permit requirements in Sec. 18-3.2, and lost parking must be replaced on-lot even on tight urban parcels.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Mauka | Urban Honolulu |
|---|---|---|
| - | - | |
| ADU Section | - | ROH Sec. 21-5.720 |
| Permit Section | - | ROH Sec. 18-3.2 |
| Parking Rule | - | Replace on-lot |
| Amnesty Cutoff | - | September 14, 2015 |
Highlighted rows indicate differences between cities.
Mililani Mauka FAQ
Will the HOA approve a full garage conversion?
Often not. Many Mililani Mauka Community Association standards require the home to keep its original garage and parking.
Can I convert just part of the garage?
Possibly, if a permit is obtained, required parking is preserved, and the HOA approves the design.
Urban Honolulu FAQ
Can I convert my carport into a studio in Kapahulu?
Only with a building permit under ROH Sec. 18-3.2. If a kitchen is added it counts as an ADU under Sec. 21-5.720, and you must replace lost parking on the lot.
What if the conversion was done without a permit years ago?
Conversions completed before September 14, 2015 may qualify for an after-the-fact permit. Otherwise the owner must legalize the work or restore the original garage.
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